Indoor single-phase epoxy resin casting current transformer conforming to GB/T20840.1/2 and IEC61869-1/2 standards. Insulation level:12/42/75kV, rated frequency 50/60Hz, secondary rated current 5A or 1A. Optional primary current ranges:30-400A、500-800A、1000-1500A; abundant accuracy combinations like 0.2S0.5/10P15 with diversified rated output specifications. Short-time thermal current 100I₁ₙ / 31.5kA, rated dynamic current 250I₁ₙ /80kA, net weight 33kg, operating ambient temperature -5℃~+40℃, suitable for metering and relay protection in medium-voltage switch cabinets.
Indoor 10kV epoxy-cast current transformer for metering and protection in MV switchgear; rated 0.66kV primary, 5A/1A secondary, accuracy 0.2/0.5/1.0.
| Parameter | Specification | Verification |
|---|---|---|
| Product Type | Current Transformer | IEC 61869 / GB/T 20840 |
| Model Code | LDJ8-10 | Factory nameplate marking |
| Primary Voltage | 0.66kV | Rated voltage test (IEC 61869-1/3) |
| Secondary Voltage | 5A/1A | Ratio check at rated frequency |
| Accuracy Class | 0.2/0.5/1.0 | Accuracy test (IEC 61869-2 / IEEE C57.13) |
| Rated Burden | [On Request] | Burden test at rated VA |
| Insulation Type | Dry Epoxy Resin | Dielectric tests per standard |
| Insulation Level (BIL) | [On Request] | Power-frequency & lightning impulse withstand |
| Standards | IEC 61869 / GB/T 20840 | Certified to listed standards |
| Frequency | 50/60Hz | Per IEC 61869-1 |
| Environment | [On Request] | Per datasheet limits |
Ideal For
Not Recommended For
Connect primary terminals P1/P2 in series with the line. Secondary terminals: 1S1/1S2 for metering winding, 2S1/2S2 for protection winding (if present). Never open-circuit the secondary of a CT while energized - hazardous voltage. Ground the secondary winding at one point. Follow IEC 61869 / GB/T 20840 terminal markings.
Compliant with: IEC 61869 / GB/T 20840
S_total = ΣS_instrument + I₂² × (ρ × 2L / A)
Q: What is the insulation level of this CT?
A: The insulation level is 12/42/75kV, meaning 12kV highest voltage for equipment, 42kV power-frequency withstand, and 75kV lightning impulse withstand.
Q: Can this CT be used for both metering and protection?
A: Yes, it offers accuracy classes 0.2/0.5/1.0 and optional 0.2S0.5/10P15, suitable for both metering and protection applications.
Q: What is the ambient temperature range?
A: The operating ambient temperature is -5°C to +40°C.
Missing fields are marked [On Request] — never fabricated. M2/M5/M6 verification rows follow IEC 61869 / IEEE C57.13 conventions.
| Rated primary current I1m (A) | Accuracy classCombined | Rated output (VA) COSφ=0.8 | Short-time thermal current Ith (kA/S) | Rated dynamic current Idyn (kA) | Weight (kg) |
|---|---|---|---|---|---|
| 30~400 | 0.2S/0.5/10P15 | 10(15)/20 | 100 I1n | 250 I1n | 33 |
| 30~400 | 0.2S/0.5/10P15 | 10/20/10 | 100 I1n | 250 I1n | 33 |
| 30~400 | 0.2S/0.5/10P20 | 10/20/7.5 | 100 I1n | 250 I1n | 33 |
| 500~800 | 0.2S/0.5/10P15 | 10(15)/20 | 31.5 | 80 | 33 |
| 500~800 | 0.2S/0.5/10P15 | 10/20/15 | 31.5 | 80 | 33 |
| 500~800 | 0.2S/0.5/10P20 | 10/20/10 | 31.5 | 80 | 33 |
| 1000~1500 | 0.2S/0.5/10P15 | 15/20/15 | 31.5 | 80 | 33 |
| 1000~1500 | 0.2S/0.5/10P15 | 15/20/10 | 31.5 | 80 | 33 |
| 1000~1500 | 0.2S/0.5/10P20 | 15/20/10 | 31.5 | 80 | 33 |
| 1000~1500 | 0.2S/0.5/10P15/10P15 | 10/10/7.5/7.5 | 31.5 | 80 | 33 |
Dimension & outline drawing of LDJ8-10 — click image to zoom / view original.
